Description  Claims  Drawing  Cited references 

JP2011005354A   [0011] 
JP2014083524A   [0011] 
JP5833791B   [0011] 
JP5749413B   [0011] 
JP2909723B   [0011] 

Hyoujun kassei odeiho ni chisso jokyo kinou wo fukasuru furyo seigyo sisutemu [Airflow control system that adds nitrogen removal function to standard activated sludge process   [0012]